Built by John Weaver, this is the only four-arch bridge spanning Antietam Creek. Once this was the area’s largest industrial complex, Frederick Forge and Furnace Works, later known as the Antietam Iron Works, producing pig iron, nails, tools, hinges, farm implements, and all the other iron commodities necessary in the thriving economy of the region. The Civil War battles that swirled around it were not the first on these fields. This was the traditional battleground of the Catawba and Delaware tribes, fighting for domination of the region’s rich resources.